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Getting a good hold-out with Keylight?
I am trying to achieve something in AE with keylight that I’ve done numerous times in Shake and Fusion with Primatte, but am getting a little stumped. When working with Primatte in these other applications, the Primatte node has a hold-out matte input. I have used this successfully to pull very clean keys when I want to preserve edge detail, by pulling one key that has very fine edges and then pulling a second key that has a much harder edge, but with all the white areas filled in so they are 100% opaque. I then take the second key and choke in on the edges to allow the nice clean edges from my first key to show through. I then plug this second key into the Primatte node’s hold-out matte input. I am trying to do the same with keylight in after effects, but haven’t had any success. Anyone have an idea how to replicate this process in AE? This is really for my own personal gratification, because I hate when people tell me that AE is a crappy compositor and I like trying to recreate things I’ve done in node compositors to show them that it can be done in AE. Any help is appreciated. Thanks!
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3 Replies
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In AE Keylight uses Masks for holdout Instead of Bitmaps…
Use Inside & Outside mask (as garbage mattes)make the masks on the layer,they may need to be animated.
Set them to none as a masking function
then select them in the popup in keylight.Shake’s way is better… because you can use it for procedural mattes
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the Procedural Matte Creation tutorial is exactly what he is tryiung to achieve. Duplicate your footage and then use keylight to make 2 mattes; the main solid matte and then a detail matte for hair and small stuff.
Then precomp both of those and combine them together in a new comp then use that new comp as your key
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I’m not sure if this will help you, but here is a tutorial on creating extremely tight junk mattes:
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Aharon Rabinowitz
aharon(AT)yahoo(DOT)com
http://www.allbetsareoff.com
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Creative Cow Master Series DVD
particleIllusion Fusion Volume 1
available @ http://www.pIllusionFusion.com
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